runtime(config): mark unportable += as an error
Commit:
https://github.com/vim/vim/commit/1e7a288cd3e522d70ad857a0a4d0ea7797f73bae
Author: Damien Lejay <[email protected]>
Date: Sun Sep 14 10:54:33 2025 -0400
runtime(config): mark unportable += as an error
closes: https://github.com/vim/vim/issues/18292
Signed-off-by: Damien Lejay <[email protected]>
Signed-off-by: Christian Brabandt <[email protected]>
diff --git a/runtime/syntax/config.vim b/runtime/syntax/config.vim
index 3636ed413..d13e89b39 100644
--- a/runtime/syntax/config.vim
+++ b/runtime/syntax/config.vim
@@ -1,10 +1,11 @@
" Vim syntax file
-" Language: configure.in script: M4 with sh
+" Language: Autoconf M4
" Former Maintainer: Christian Hammesr <[email protected]>
" Last Change: 2018 Feb 03
" (patch from Yngve Inntjore Levinsen to detect
AC_MSG)
" (patch from Khym Chanur to add @Spell)
" (patch from James McCoy to fix paren matching)
+" (2025 Sep 14 patch from Damien Lejay to detect
unportable +=)
" Well, I actually even do not know much about m4. This explains why there
" is probably very much missing here, yet !
@@ -34,6 +35,9 @@ syn region configstring start=+\z(["'`]\)+ skip=+\\z1+
end=+\z1+ contains=@
syn region configmsg matchgroup=configfunction start="AC_MSG_[A-Z]*\ze(\["
matchgroup=configdelimiter end="\])" contains=configdelimiter,@Spell
syn region configmsg matchgroup=configfunction start="AC_MSG_[A-Z]*\ze([^[]"
matchgroup=configdelimiter end=")" contains=configdelimiter,@Spell
+" Help write portable shell code
+syn match acPlusEq ' \+\=' containedin=ALLBUT,configcomment
+
" Define the default highlighting.
" Only when an item doesn't have highlighting yet
@@ -47,6 +51,7 @@ hi def link configkeyword Keyword
hi def link configspecial Special
hi def link configstring String
hi def link configmsg String
+hi def link acPlusEq Error
let b:current_syntax = "config"
--
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